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a force of 10 Newtons upward is applied to a 5 kg object rest on a flat table on earth. what is the object's acceleration? is it 2 or 0 m/s^2?

A rubidium atom travelling at the speed of sound absorbs photons from an oncoming laser beam. Each photon can be viewed as a tiny ping pong ball having momentum 7.79 x 10-28 Nt/sec. The atom absorbs a photon which is then reradiated in any direction. Hence, on average each photon...

A weightlifter raises 250 kg from the floor to a height of 2 meters. a) How much work does he do if: i) the object is raised straight up ii) the object is first raised one meter straight up, then sideways 3.5 meters to the left followed by another meter straight up and finally 3.5 meters to the...